Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Analysis of Mechanism for the Gas Sensor of MWCNT/ZnO Composites Film Using the NOX Gas Detection Characteristics

NOX 가스 검출 특성을 이용한 MWCNT/ZnO 복합체 필름 가스 센서의 메커니즘 분석

  • Son, Ju-Hyung (Department of Electrical Engineering, Gachon University) ;
  • Kim, Hyun-Soo (Department of Electrical Engineering, Gachon University) ;
  • Park, Yong-Seo (Department of Electrical Engineering, Gachon University) ;
  • Jang, Kyung-Uk (Department of Electrical Engineering, Gachon University)
  • Received : 2017.12.13
  • Accepted : 2017.12.27
  • Published : 2018.03.01
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Abstract

In this study, we fabricated an $NO_X$ gas sensor using a composite film of multi-walled carbon nanotubes (MWCNT)/zinc oxide (ZnO). Carbon nanotubes (CNTs) show good electronic conductivity and chemical-stability, and zinc oxide (ZnO) is a wide band gap semiconductor with a large exciton binding energy. Gas sensors require characteristics such as high speed, sensitivity, and selectivity. The fabricated gas sensor was used to detect $NO_X$ gas at different $NO_X$ concentrations. The sensitivity of the gas sensor increased with increasing gas concentrations. Additionally, while changing the temperature inside the chamber containing the MWCNT/ZnO gas sensor, we obtained the sensitivity and normalized responses for detecting $NO_X$ gas in comparison to ZnO and MWCNT film gas sensors. From the experimental results, we confirmed that the gas sensor sensing mechanism was enhanced in the composite-film gas-sensor and that the electronic interaction between MWCNT and ZnO contributed to the improved sensor performance.

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References

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